/**
* @author Sean Griffin / http://twitter.com/sgrif
* @author Michael Guerrero / http://realitymeltdown.com
* @author mrdoob / http://mrdoob.com/
* @author ikerr / http://verold.com
*/
export class SkeletonHelper {
   // THREE.SkeletonHelper = function(object) {
   //    this.bones = this.getBoneList(object);
   //    var geometry = new THREE.Geometry();
   //    for (var i = 0; i < this.bones.length; i++) {
   //       var bone = this.bones[i];
   //       if (bone.parent instanceof THREE.Bone) {
   //          geometry.vertices.push(new THREE.Vector3());
   //          geometry.vertices.push(new THREE.Vector3());
   //          geometry.colors.push(new THREE.Color(0, 0, 1));
   //          geometry.colors.push(new THREE.Color(0, 1, 0));
   //       }
   //    }
   //    geometry.dynamic = true;
   //    var material = new THREE.LineBasicMaterial({ vertexColors: THREE.VertexColors, depthTest: false, depthWrite: false, transparent: true });
   //    THREE.LineSegments.call(this, geometry, material);
   //    this.root = object;
   //    this.matrix = object.matrixWorld;
   //    this.matrixAutoUpdate = false;
   //    this.update();
   // };
   // THREE.SkeletonHelper.prototype = Object.create(THREE.LineSegments.prototype);
   // THREE.SkeletonHelper.prototype.constructor = THREE.SkeletonHelper;
   // THREE.SkeletonHelper.prototype.getBoneList = function(object) {
   //    var boneList = [];
   //    if (object instanceof THREE.Bone) {
   //       boneList.push(object);
   //    }
   //    for (var i = 0; i < object.children.length; i++) {
   //       boneList.push.apply(boneList, this.getBoneList(object.children[i]));
   //    }
   //    return boneList;
   // };
   // THREE.SkeletonHelper.prototype.update = function() {
   //    var geometry = this.geometry;
   //    var matrixWorldInv = new THREE.Matrix4().getInverse(this.root.matrixWorld);
   //    var boneMatrix = new THREE.Matrix4();
   //    var j = 0;
   //    for (var i = 0; i < this.bones.length; i++) {
   //       var bone = this.bones[i];
   //       if (bone.parent instanceof THREE.Bone) {
   //          boneMatrix.multiplyMatrices(matrixWorldInv, bone.matrixWorld);
   //          geometry.vertices[j].setFromMatrixPosition(boneMatrix);
   //          boneMatrix.multiplyMatrices(matrixWorldInv, bone.parent.matrixWorld);
   //          geometry.vertices[j + 1].setFromMatrixPosition(boneMatrix);
   //          j += 2;
   //       }
   //    }
   //    geometry.verticesNeedUpdate = true;
   //    geometry.computeBoundingSphere();
   // };
}